linux-kernel - Re: [PATCH] ftrace,kcfi: Separate ftrace_stub() and ftrace_stub

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Date:   Tue, 18 Oct 2022 15:18:46 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Steven Rostedt <rostedt@...dmis.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org, Mark Rutland <mark.rutland@....com>
Cc:     Kees Cook <keescook@...omium.org>,
        Sami Tolvanen <samitolvanen@...gle.com>
Subject: Re: [PATCH] ftrace,kcfi: Separate ftrace_stub() and
 ftrace_stub_graph()

On Tue, Oct 18, 2022 at 02:35:16PM +0200, Peter Zijlstra wrote:
> --- a/include/asm-generic/vmlinux.lds.h
> +++ b/include/asm-generic/vmlinux.lds.h
> @@ -162,6 +162,16 @@
>  #define PATCHABLE_DISCARDS	*(__patchable_function_entries)
>  #endif
>  
> +#ifndef ARCH_SUPPORTS_CFI_CLANG

#ifndef CONFIG_ARCH_..

works much better as we found.

> +/*
> + * Simply points to ftrace_stub, but with the proper protocol.
> + * Defined by the linker script in linux/vmlinux.lds.h
> + */
> +#define	FTRACE_STUB_HACK	ftrace_stub_graph = ftrace_stub;
> +#else
> +#define FTRACE_STUB_HACK
> +#endif

Fixed up version available at:

  git://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git x86/urgent